deteriorate

1. (transitive) To make worse; to make inferior in quality or value; to impair.Examples: "to deteriorate the mind"; "The art of war, like every other art, ecclesiastical architecture alone excepted, was greatly deteriorated during those years of general degradation[…]"transitive

2. (intransitive) To grow worse; to be impaired in quality; to degenerate.Examples: "During this fine run through Fife the weather had deteriorated rapidly, and as we passed Wormit and came onto the Tay Bridge heavy rain clouds were piled over the sea."; "It was turning into an abysmal afternoon for Newcastle and it deteriorated further when Tiote saw red for his challenge on Jon Ashton."intransitive